package com.wires.lu.practice;

import java.util.HashMap;
import java.util.WeakHashMap;

public class WeakHashMapDemo {


    public static void main(String[] args) {
        myHashMap();
        System.out.println("============");
        myWeakHashMap();
    }

    public static  void myHashMap(){
        HashMap<Integer,String> map=new HashMap<>();
        Integer key=new Integer(2);
        String value="WeakHashMap";
        map.put(key,value);
        System.out.println(map);
        key=null;
        System.out.println(map);
        System.gc();
        System.out.println(map+"\t"+map.size());
    }

    public static  void  myWeakHashMap(){
        WeakHashMap<Integer,String> map=new WeakHashMap<>();
        Integer key=new Integer(1);
        String value="HashMap";
        map.put(key,value);
        System.out.println(map);
        key=null;
        System.out.println(map);
        System.gc();
        System.out.println(map+"\t"+map.size());
    }

}
